/Engine/Plugins/Runtime/MassGameplay/Source/MassSmartObjects/Public/MassSmartObjectTypes.h
The struct can also be used to be added to a Smart Object slot when it gets claimed. e.g. Claim(SlotHandle, FConstStructView::Make(FSmartObjectMassEntityUserData(Entity)));
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)() struct FSmartObjectMassEntityUserData
FMassEntityHand...
UserEntity